/* vi:set ts=8 sts=4 sw=4 noet:
 *
 * VIM - Vi IMproved	by Bram Moolenaar
 *
 * Do ":help uganda"  in Vim to read copying and usage conditions.
 * Do ":help credits" in Vim to see a list of people who contributed.
 * See README.txt for an overview of the Vim source code.
 */

/*
 * spell.h: common code for spell checking, used by spell.c and spellfile.c.
 */

/* Use SPELL_PRINTTREE for debugging: dump the word tree after adding a word.
 * Only use it for small word lists! */
#if 0
# define SPELL_PRINTTREE
#endif

/* Use SPELL_COMPRESS_ALLWAYS for debugging: compress the word tree after
 * adding a word.  Only use it for small word lists! */
#if 0
# define SPELL_COMPRESS_ALLWAYS
#endif

/* Use DEBUG_TRIEWALK to print the changes made in suggest_trie_walk() for a
 * specific word. */
#if 0
# define DEBUG_TRIEWALK
#endif

#define MAXWLEN 254		/* Assume max. word len is this many bytes.
				   Some places assume a word length fits in a
				   byte, thus it can't be above 255.
				   Must be >= PFD_NOTSPECIAL. */

#define MAXREGIONS 8		/* Number of regions supported. */

/* Type used for indexes in the word tree need to be at least 4 bytes.  If int
 * is 8 bytes we could use something smaller, but what? */
typedef int idx_T;

typedef int salfirst_T;

/*
 * Structure used to store words and other info for one language, loaded from
 * a .spl file.
 * The main access is through the tree in "sl_fbyts/sl_fidxs", storing the
 * case-folded words.  "sl_kbyts/sl_kidxs" is for keep-case words.
 *
 * The "byts" array stores the possible bytes in each tree node, preceded by
 * the number of possible bytes, sorted on byte value:
 *	<len> <byte1> <byte2> ...
 * The "idxs" array stores the index of the child node corresponding to the
 * byte in "byts".
 * Exception: when the byte is zero, the word may end here and "idxs" holds
 * the flags, region mask and affixID for the word.  There may be several
 * zeros in sequence for alternative flag/region/affixID combinations.
 */
typedef struct slang_S slang_T;
struct slang_S
{
    slang_T	*sl_next;	/* next language */
    char_u	*sl_name;	/* language name "en", "en.rare", "nl", etc. */
    char_u	*sl_fname;	/* name of .spl file */
    int		sl_add;		/* TRUE if it's a .add file. */

    char_u	*sl_fbyts;	/* case-folded word bytes */
    idx_T	*sl_fidxs;	/* case-folded word indexes */
    char_u	*sl_kbyts;	/* keep-case word bytes */
    idx_T	*sl_kidxs;	/* keep-case word indexes */
    char_u	*sl_pbyts;	/* prefix tree word bytes */
    idx_T	*sl_pidxs;	/* prefix tree word indexes */

    char_u	*sl_info;	/* infotext string or NULL */

    char_u	sl_regions[MAXREGIONS * 2 + 1];
				/* table with up to 8 region names plus NUL */

    char_u	*sl_midword;	/* MIDWORD string or NULL */

    hashtab_T	sl_wordcount;	/* hashtable with word count, wordcount_T */

    int		sl_compmax;	/* COMPOUNDWORDMAX (default: MAXWLEN) */
    int		sl_compminlen;	/* COMPOUNDMIN (default: 0) */
    int		sl_compsylmax;	/* COMPOUNDSYLMAX (default: MAXWLEN) */
    int		sl_compoptions;	/* COMP_* flags */
    garray_T	sl_comppat;	/* CHECKCOMPOUNDPATTERN items */
    regprog_T	*sl_compprog;	/* COMPOUNDRULE turned into a regexp progrm
				 * (NULL when no compounding) */
    char_u	*sl_comprules;	/* all COMPOUNDRULE concatenated (or NULL) */
    char_u	*sl_compstartflags; /* flags for first compound word */
    char_u	*sl_compallflags; /* all flags for compound words */
    char_u	sl_nobreak;	/* When TRUE: no spaces between words */
    char_u	*sl_syllable;	/* SYLLABLE repeatable chars or NULL */
    garray_T	sl_syl_items;	/* syllable items */

    int		sl_prefixcnt;	/* number of items in "sl_prefprog" */
    regprog_T	**sl_prefprog;	/* table with regprogs for prefixes */

    garray_T	sl_rep;		/* list of fromto_T entries from REP lines */
    short	sl_rep_first[256];  /* indexes where byte first appears, -1 if
				       there is none */
    garray_T	sl_sal;		/* list of salitem_T entries from SAL lines */
    salfirst_T	sl_sal_first[256];  /* indexes where byte first appears, -1 if
				       there is none */
    int		sl_followup;	/* SAL followup */
    int		sl_collapse;	/* SAL collapse_result */
    int		sl_rem_accents;	/* SAL remove_accents */
    int		sl_sofo;	/* SOFOFROM and SOFOTO instead of SAL items:
				 * "sl_sal_first" maps chars, when has_mbyte
				 * "sl_sal" is a list of wide char lists. */
    garray_T	sl_repsal;	/* list of fromto_T entries from REPSAL lines */
    short	sl_repsal_first[256];  /* sl_rep_first for REPSAL lines */
    int		sl_nosplitsugs;	/* don't suggest splitting a word */
    int		sl_nocompoundsugs; /* don't suggest compounding */

    /* Info from the .sug file.  Loaded on demand. */
    time_t	sl_sugtime;	/* timestamp for .sug file */
    char_u	*sl_sbyts;	/* soundfolded word bytes */
    idx_T	*sl_sidxs;	/* soundfolded word indexes */
    buf_T	*sl_sugbuf;	/* buffer with word number table */
    int		sl_sugloaded;	/* TRUE when .sug file was loaded or failed to
				   load */

    int		sl_has_map;	/* TRUE if there is a MAP line */
    hashtab_T	sl_map_hash;	/* MAP for multi-byte chars */
    int		sl_map_array[256]; /* MAP for first 256 chars */
    hashtab_T	sl_sounddone;	/* table with soundfolded words that have
				   handled, see add_sound_suggest() */
};

#ifdef VMS
# define SPL_FNAME_TMPL  "%s_%s.spl"
# define SPL_FNAME_ADD   "_add."
# define SPL_FNAME_ASCII "_ascii."
#else
# define SPL_FNAME_TMPL  "%s.%s.spl"
# define SPL_FNAME_ADD   ".add."
# define SPL_FNAME_ASCII ".ascii."
#endif

/* Flags used for a word.  Only the lowest byte can be used, the region byte
 * comes above it. */
#define WF_REGION   0x01	/* region byte follows */
#define WF_ONECAP   0x02	/* word with one capital (or all capitals) */
#define WF_ALLCAP   0x04	/* word must be all capitals */
#define WF_RARE	    0x08	/* rare word */
#define WF_BANNED   0x10	/* bad word */
#define WF_AFX	    0x20	/* affix ID follows */
#define WF_FIXCAP   0x40	/* keep-case word, allcap not allowed */
#define WF_KEEPCAP  0x80	/* keep-case word */

#define WF_CAPMASK (WF_ONECAP | WF_ALLCAP | WF_KEEPCAP | WF_FIXCAP)

/* for <flags2>, shifted up one byte to be used in wn_flags */
#define WF_HAS_AFF  0x0100	/* word includes affix */
#define WF_NEEDCOMP 0x0200	/* word only valid in compound */
#define WF_NOSUGGEST 0x0400	/* word not to be suggested */
#define WF_COMPROOT 0x0800	/* already compounded word, COMPOUNDROOT */
#define WF_NOCOMPBEF 0x1000	/* no compounding before this word */
#define WF_NOCOMPAFT 0x2000	/* no compounding after this word */

/* flags for <pflags> */
#define WFP_RARE	    0x01	/* rare prefix */
#define WFP_NC		    0x02	/* prefix is not combining */
#define WFP_UP		    0x04	/* to-upper prefix */
#define WFP_COMPPERMIT	    0x08	/* prefix with COMPOUNDPERMITFLAG */
#define WFP_COMPFORBID	    0x10	/* prefix with COMPOUNDFORBIDFLAG */

/* Flags for postponed prefixes in "sl_pidxs".  Must be above affixID (one
 * byte) and prefcondnr (two bytes). */
#define WF_RAREPFX  (WFP_RARE << 24)	/* rare postponed prefix */
#define WF_PFX_NC   (WFP_NC << 24)	/* non-combining postponed prefix */
#define WF_PFX_UP   (WFP_UP << 24)	/* to-upper postponed prefix */
#define WF_PFX_COMPPERMIT (WFP_COMPPERMIT << 24) /* postponed prefix with
						  * COMPOUNDPERMITFLAG */
#define WF_PFX_COMPFORBID (WFP_COMPFORBID << 24) /* postponed prefix with
						  * COMPOUNDFORBIDFLAG */

/* flags for <compoptions> */
#define COMP_CHECKDUP		1	/* CHECKCOMPOUNDDUP */
#define COMP_CHECKREP		2	/* CHECKCOMPOUNDREP */
#define COMP_CHECKCASE		4	/* CHECKCOMPOUNDCASE */
#define COMP_CHECKTRIPLE	8	/* CHECKCOMPOUNDTRIPLE */

/* Info from "REP", "REPSAL" and "SAL" entries in ".aff" file used in si_rep,
 * si_repsal, sl_rep, and si_sal.  Not for sl_sal!
 * One replacement: from "ft_from" to "ft_to". */
typedef struct fromto_S
{
    char_u	*ft_from;
    char_u	*ft_to;
} fromto_T;

/* Info from "SAL" entries in ".aff" file used in sl_sal.
 * The info is split for quick processing by spell_soundfold().
 * Note that "sm_oneof" and "sm_rules" point into sm_lead. */
typedef struct salitem_S
{
    char_u	*sm_lead;	/* leading letters */
    int		sm_leadlen;	/* length of "sm_lead" */
    char_u	*sm_oneof;	/* letters from () or NULL */
    char_u	*sm_rules;	/* rules like ^, $, priority */
    char_u	*sm_to;		/* replacement. */
    int		*sm_lead_w;	/* wide character copy of "sm_lead" */
    int		*sm_oneof_w;	/* wide character copy of "sm_oneof" */
    int		*sm_to_w;	/* wide character copy of "sm_to" */
} salitem_T;

/* Values for SP_*ERROR are negative, positive values are used by
 * read_cnt_string(). */
#define	SP_TRUNCERROR	-1	/* spell file truncated error */
#define	SP_FORMERROR	-2	/* format error in spell file */
#define SP_OTHERERROR	-3	/* other error while reading spell file */

/*
 * Structure used in "b_langp", filled from 'spelllang'.
 */
typedef struct langp_S
{
    slang_T	*lp_slang;	/* info for this language */
    slang_T	*lp_sallang;	/* language used for sound folding or NULL */
    slang_T	*lp_replang;	/* language used for REP items or NULL */
    int		lp_region;	/* bitmask for region or REGION_ALL */
} langp_T;

#define LANGP_ENTRY(ga, i)	(((langp_T *)(ga).ga_data) + (i))

#define VIMSUGMAGIC "VIMsug"	/* string at start of Vim .sug file */
#define VIMSUGMAGICL 6
#define VIMSUGVERSION 1

/*
 * The tables used for recognizing word characters according to spelling.
 * These are only used for the first 256 characters of 'encoding'.
 */
typedef struct spelltab_S
{
    char_u  st_isw[256];	/* flags: is word char */
    char_u  st_isu[256];	/* flags: is uppercase char */
    char_u  st_fold[256];	/* chars: folded case */
    char_u  st_upper[256];	/* chars: upper case */
} spelltab_T;

/*
 * Use our own character-case definitions, because the current locale may
 * differ from what the .spl file uses.
 * These must not be called with negative number!
 */
#if defined(HAVE_WCHAR_H)
# include <wchar.h>	    /* for towupper() and towlower() */
#endif
/* Multi-byte implementation.  For Unicode we can call utf_*(), but don't do
 * that for ASCII, because we don't want to use 'casemap' here.  Otherwise use
 * the "w" library function for characters above 255 if available. */
#ifdef HAVE_TOWLOWER
# define SPELL_TOFOLD(c) (enc_utf8 && (c) >= 128 ? utf_fold(c) \
	    : (c) < 256 ? (int)spelltab.st_fold[c] : (int)towlower(c))
#else
# define SPELL_TOFOLD(c) (enc_utf8 && (c) >= 128 ? utf_fold(c) \
	    : (c) < 256 ? (int)spelltab.st_fold[c] : (c))
#endif

#ifdef HAVE_TOWUPPER
# define SPELL_TOUPPER(c) (enc_utf8 && (c) >= 128 ? utf_toupper(c) \
	    : (c) < 256 ? (int)spelltab.st_upper[c] : (int)towupper(c))
#else
# define SPELL_TOUPPER(c) (enc_utf8 && (c) >= 128 ? utf_toupper(c) \
	    : (c) < 256 ? (int)spelltab.st_upper[c] : (c))
#endif

#ifdef HAVE_ISWUPPER
# define SPELL_ISUPPER(c) (enc_utf8 && (c) >= 128 ? utf_isupper(c) \
	    : (c) < 256 ? spelltab.st_isu[c] : iswupper(c))
#else
# define SPELL_ISUPPER(c) (enc_utf8 && (c) >= 128 ? utf_isupper(c) \
	    : (c) < 256 ? spelltab.st_isu[c] : (FALSE))
#endif

#ifdef FEAT_SPELL
/* First language that is loaded, start of the linked list of loaded
 * languages. */
# ifdef IN_SPELL_C
#  define SPELL_EXTERN
#  define SPELL_INIT(x) x
# else
#  define SPELL_EXTERN extern
#  define SPELL_INIT(x)
# endif

SPELL_EXTERN slang_T	*first_lang SPELL_INIT(= NULL);

/* file used for "zG" and "zW" */
SPELL_EXTERN char_u	*int_wordlist SPELL_INIT(= NULL);


SPELL_EXTERN char e_format[] SPELL_INIT(= N_("E759: Format error in spell file"));

SPELL_EXTERN spelltab_T   spelltab;
SPELL_EXTERN int	  did_set_spelltab;

// Values for "what" argument of spell_add_word()
#define SPELL_ADD_GOOD	0
#define SPELL_ADD_BAD	1
#define SPELL_ADD_RARE	2

typedef struct wordcount_S
{
    short_u	wc_count;	    /* nr of times word was seen */
    char_u	wc_word[1];	    /* word, actually longer */
} wordcount_T;

#define WC_KEY_OFF  offsetof(wordcount_T, wc_word)
#define HI2WC(hi)     ((wordcount_T *)((hi)->hi_key - WC_KEY_OFF))
#define MAXWORDCOUNT 0xffff

/* Remember what "z?" replaced. */
SPELL_EXTERN char_u	*repl_from SPELL_INIT(= NULL);
SPELL_EXTERN char_u	*repl_to SPELL_INIT(= NULL);
#endif
